黄泛平原土壤中有效态锰的分布及锰肥的增产效果

Special Distribution of Active Manganese in Soils and the Crop Growth in Xinxiang District of Henan

应用田间试验和室内分析相结合的方法探讨了黄泛平原土壤中锰的生物有效性，土壤中锰的赋存形态和锰肥的增产效果。结果显示，黄泛区土壤中活性锰的含量普遍较低，８５．８０％的农田土壤处于缺锰状态。潮土中的锰，４０％是以对植物无效的残留态和晶形铁结合态存在，仅有０．０６％的锰是以植物可直接吸收利用的代换志存在的，还有４０％的锰以氧化物形态存在，虽然有效性较高，但需经还原转化。因此本区土壤施用锰肥具有一定的增产作用，幅度为０～３４．３％，视作物种类和土壤质地而定。在当前农作条件下，锰肥宜施在砂质土壤和豆科作物上，其他类型土壤近年不会出现严重的缺锰现象。

The results of study on the manganese status in soils of Xinxinang district of Henan province indicated that the main soil type in this district was the yellow fluviogenic soil derived from the alluvium of the Yellow River,and the soils were very poor in manganese,in 85,25% of soil symples the active manganese was below the critical values(100pg.g-1).Nearly forty percent of total manganese existed in residual fraction and crystalline iron oxide fraction,and only 0.57% in exchangeable fraction, but nearly forty percent in manganese oxide fraction which although could be activated,but very slowly be absorbed by the plants.So fertilization with manganese can increase yield of soybean, wheat,especially legume.Under the present condition of agricultural culture,fertilization with manganese in sandy soils is of benefit to legume such as soybean.